Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0468a1560b36307eded68aae649178904a2efdee0bf451ffd79bb5357f01695f' 
  AND token = 'pDCWG35VO5j1RfB8PjN9v63zkwCvvzNpcBqYpdgAdEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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