Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b2ece622004f56018a840d0dda53038084a45f7c8f93db89724ca81571a0b2' 
  AND token = 'pJ6tByH379y2UGu57olJ3jJOpNIDE/kbMyRBALsGmis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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