Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31be3c12aef9f9eb83e447f8a37d021af304098ab724bb7c5f0aae6283330dc3' 
  AND token = 'XhktKbOsl2OgS8MtpH0OZ9yC3egM1o4r4SWlITZQvnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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