Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dc5cdbbe6fa814f1cb6d15d3f9f28ab1af340f654cb08f4c1e2f341562dda7' 
  AND token = 'ppUpi4PYi82KivczmNyffVJfntz5JzmoAjSM+1uy+Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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