Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7839cfc0d68389d713c3b80dd71086c5a3a046b41b2ab4a857e7716f05e73228' 
  AND token = '5z6orL2gYDF+H60NbMFR6aNRdf2Os7tEyAezA834rIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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