Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b89924716d727167750e2f7e7ee1b7ed37bc8adb5b73e3b14532b69dc95eb3b' 
  AND token = 'ZE+I7/s7e7bSwcZXyuXJjQgTPE/x7+qZ18umRPvqDXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}