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the MySQL query http linkconditions & information to use data
 NO LOG
The following query for JUNG returned 289 rows
SELECT DATE_ADD('0000-01-01 00:00:00', INTERVAL 60*5*FLOOR((TIME_TO_SEC(TIME(start_date_time))+86400*(TO_DAYS(start_date_time)-1))/(60*5)) SECOND) AS start_date_time, AVG(measured_corr_for_efficiency) AS corr_for_efficiency FROM JUNG_ori WHERE start_date_time >='2018-07-15 14:10:00' AND start_date_time < '2018-07-16 14:15:00' GROUP BY FLOOR((TIME_TO_SEC(TIME(start_date_time))+86400*TO_DAYS(start_date_time))/(60*5)) ORDER BY start_date_time ASC

The following query for JUNG1 returned 289 rows
SELECT DATE_ADD('0000-01-01 00:00:00', INTERVAL 60*5*FLOOR((TIME_TO_SEC(TIME(start_date_time))+86400*(TO_DAYS(start_date_time)-1))/(60*5)) SECOND) AS start_date_time, AVG(measured_corr_for_efficiency) AS corr_for_efficiency FROM JUNG1_ori WHERE start_date_time >='2018-07-15 14:10:00' AND start_date_time < '2018-07-16 14:15:00' GROUP BY FLOOR((TIME_TO_SEC(TIME(start_date_time))+86400*TO_DAYS(start_date_time))/(60*5)) ORDER BY start_date_time ASC

Total Execution Time:2.326 sec (1.047 sec for mysql query)