Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2cd9bdda1ea042b1440365777a8a6422d13b40342047fccf383c350bb84667' 
  AND token = '84OwVSanfc0FMVVfA+ptwcTVH9nZkHQXhsfaVKuZsQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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