SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '36f5169768f08f997b549e4285e1d1780df08182dc045ca47c3092c865c8b23c' 
  AND token = 'wWXtxyAJ73K+vehL0+fPhADCSFM7PV6+6+aZ07L5BKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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