Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63660c3a961e1a924acda144ebb92e449d6cfed9c3d158908d828782df751c92' 
  AND token = 'yAY1YxH9Ee29GscGya8UlZItnHJwUYkGMyhHhOwHqHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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