Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391bc517c0e5ebc824cd4b30229dbd9d6e5def0320da454ebb20e90610f5caf8' 
  AND token = 'E5bcm4RwHWRQyJB3a04nsSBFCbPRdBas4oEN6brfQ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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