Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f3fa60eb80c437e6de7ce2f00f3033ae48fe000b5b77705de0ee96864a29f5' 
  AND token = 'z5GYmQUiIxtSj/aYewSQ15/hiWLpK9G4SFof+xEumfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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