Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3283fcd21547863478bff272ebb11c9c8d9e27382ab67979212e739ee8a4e36' 
  AND token = 'QSwTxn4dDIzdvVAQ4cH+tOsoEBikx9EjL8J4Mv/qcME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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