public boolean isActive() {
        return active;
    }
{@value OAuth2Constants#ACTIVE} Token Introspection Response field,
REQUIRED. Boolean indicator of whether or not the presented token is currently active. The
specifics of a token's "active" state will vary depending on the implementation of the
authorization server and the information it keeps about its tokens, but a "true" value return
for the "active" property will generally indicate that a given token has been issued by this
authorization server, has not been revoked by the resource owner, and is within its given time
window of validity (e.g., after its issuance time and before its expiration time).
oauth2/src/main/java/com/linecorp/armeria/common/auth/oauth2/OAuth2TokenDescriptor.java