boolean isExpired() {
            final long elapsedNanos = System.nanoTime() - createdAtNanos;
            return elapsedNanos >= tokenTtlNanos;
        }
A Nacos client that is responsible for
<a href="https://nacos.io/en-us/docs/auth.html">Nacos Authentication</a>.
nacos/src/main/java/com/linecorp/armeria/internal/nacos/LoginClient.java