Mysql fetches segmented data before the current time

as shown in the following figure

the current time is 16 / 41 / 00. I want to take this section of data every two hours. How should sql write

?
Feb.27,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bd3754-30e64.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bd3754-30e64.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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