Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c7d2ed1b34e3a471b20ee3111ee860739d86e0be168b64246ad6d522a96223' 
  AND token = 'fha6Z9uQP9w7keIbXRTHykf14sRiUAEblEaj9QKFPnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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