Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfb34d40e9dce338c1f1ed762e5c3b7ec1c0d0f924521032690649af0f12e59' 
  AND token = 'xfRpNpMU3zyiMMMsKZGMTD22YxVY9Fdr2JHnvAbfW1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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