Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4034f8b8a3ed0d3e3057fbfe9cb94fcaf13bad4e3131223d7b73a3bcc446ee77' 
  AND token = '4AX+kxKUce8rItgbMmFEpJhYD41x0+yw/Tkk3EPmzh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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