Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f057f0d82a90133ee57808c07c9852f84619fc0ab79f30ba389d873e375fdc' 
  AND token = 'dLm48Wr9h4LFCN9OBlgpEOKheuBZnRu1zce/0ic350o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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