Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039c07cd1737f95bf07c80dcd061b40a1c613986a3b52aecb33ef2e83a8b3b37' 
  AND token = 'tIJgbHOz8fGm2UqiA2lRz6zZ9oq9NytmzKJwEGZHk+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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