SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '459c7e216b2f49136ea3d494947b39c4fad1db597a69aec0f228bfc3f7c324b1' 
  AND token = 'Gnxv5owJCTV2Kw6uHMvMlCsFZOWmiphY0nQ38QCLTsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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