Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f58ab9c10e172c0d8131e2dc6aa646c648e8de0b2743e0ea00144e94ab30c4' 
  AND token = '42FHHItPKvAUICi/Nqo50pdZf2BseXIgtF8J9KhVBkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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