Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5151801daf4954fd38dd393ae3c78cbe85aa1038a90d57cce9877495898ff63b' 
  AND token = '2PPypTk2O66etOYBNPVVxkeWaI8SQkhWPwGjy1lyPSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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