Why is a query with one outer join taking so long? - mysql

Question

I have the following query:
SELECT t.TOUR, t.ROUND, t.ID1, t.ID2
FROM belgarath.today_atp AS t
LEFT OUTER JOIN belgarath.match_ as m
ON m.tour_id = 0
AND t.TOUR = m.tours_ID_T
AND t.ROUND = m.rounds_ID_R
AND t.ID1 = m.today_players_ID1
AND t.ID2 = m.today_players_ID2
WHERE m.id_ IS NULL;
I'm looking to get the records from today_atp where they don't exist in match_.
I've given up on the query after 30 mins as this seems like it's taking too long for tables which have 700 rows (today_atp) and 1.4m rows (match_).
I tried just pulling one record via this query:
SELECT t.TOUR, t.ROUND, t.ID1, t.ID2
FROM belgarath.today_atp AS t
LEFT OUTER JOIN belgarath.match_ as m
ON m.tour_id = 0
AND t.TOUR = m.tours_ID_T
AND t.ROUND = m.rounds_ID_R
AND t.ID1 = m.today_players_ID1
AND t.ID2 = m.today_players_ID2
WHERE m.id_ IS NULL
AND t.TOUR = 16756
AND t.ROUND = 2
AND t.ID1 = 29591
AND t.ID2 = 37741;
This takes 30 seconds.
The specs for the two tables are as follows:
CREATE TABLE `match_` (
`id_` int DEFAULT NULL,
`date_time_scheduled` datetime DEFAULT NULL,
`date_time_actual` datetime DEFAULT NULL,
`tour_id` int NOT NULL,
`tournament_id` int DEFAULT NULL,
`tours_ID_T` int NOT NULL,
`rounds_ID_R` int NOT NULL,
`today_players_ID1` int DEFAULT NULL,
`today_players_ID2` int DEFAULT NULL,
`games_players_ID1` int DEFAULT NULL,
`games_players_ID2` int DEFAULT NULL,
`uncertainty_bin` int DEFAULT NULL,
`p1_win_pred_ogion` float DEFAULT NULL,
`p1_win_pred_rf_ogion` float DEFAULT NULL,
`p1_win_pred_ged` float DEFAULT NULL,
`p1_win_pred_rf_ged` float DEFAULT NULL,
`url` varchar(255) DEFAULT NULL,
`winning_player` int DEFAULT NULL,
`completed_sets` int DEFAULT NULL,
`result_type_id` int DEFAULT NULL,
`p1_pinnacle_closing_odds` float DEFAULT NULL,
`p2_pinnacle_closing_odds` float DEFAULT NULL,
`p1_pinnacle_opening_odds` float DEFAULT NULL,
`p2_pinnacle_opening_odds` float DEFAULT NULL,
`post_match_data_retrieved` int DEFAULT NULL,
`updated` datetime DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`created` timestamp NULL DEFAULT CURRENT_TIMESTAMP,
KEY `ix_belgarath_match__tours_ID_T` (`tours_ID_T`),
KEY `ix_belgarath_match__today_players_ID1` (`today_players_ID1`),
KEY `ix_belgarath_match__games_players_ID1` (`games_players_ID1`),
KEY `ix_belgarath_match__tour_id` (`tour_id`),
KEY `ix_belgarath_match__rounds_ID_R` (`rounds_ID_R`),
KEY `ix_belgarath_match__today_players_ID2` (`today_players_ID2`),
KEY `ix_belgarath_match__games_players_ID2` (`games_players_ID2`),
KEY `ix_belgarath_match__uncertainty_bin` (`uncertainty_bin`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
And:
CREATE TABLE `today_atp` (
`TOUR` int NOT NULL DEFAULT '0',
`DATE_GAME` datetime DEFAULT NULL,
`ID1` int NOT NULL DEFAULT '0',
`ID2` int NOT NULL DEFAULT '0',
`ROUND` int NOT NULL DEFAULT '0',
`DRAW` int NOT NULL DEFAULT '0',
`RESULT` tinytext,
`COMPLETE` tinyint unsigned DEFAULT '0',
`live` char(70) DEFAULT NULL,
`TIME_GAME` datetime DEFAULT NULL,
`RESERVE_INT` smallint DEFAULT NULL,
`RESERVE_CHAR` char(64) DEFAULT NULL,
KEY `today_atp_TOUR` (`TOUR`) /*!80000 INVISIBLE */,
KEY `today_atp_ROUND` (`ROUND`) /*!80000 INVISIBLE */,
KEY `today_atp_ID1` (`ID1`) /*!80000 INVISIBLE */,
KEY `today_atp_ID2` (`ID2`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
Is there anything obvious that jumps out as to why it would be taking so long?
I have seen from other posts that CHARSET can be a problem but changing today_atp to utf8mb4 doesn't make a difference (I'm not sure how to set the COLLATE part via workbench).
(P.S. Some normalisation of the tables is definitely on my to do list!)