Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a3bf44129261cfb0fd049b3daca2158a60c5333d1b1220674eb9ffb76366df' 
  AND token = '28CWtAwsifp462xbKUDaXe8AeBzeBEdyIj6BbXDPcWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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