SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6caa642af0414f88d3890af81119632cba65779dd7f1b9ce9caa954b7a7400cd' 
  AND token = '/RqNOnlQ2bhh01STAJ6LjZ2N/J2Hv//YiDHvU/xI+4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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