Man pages matching name dbix::class::helper::resultset::explain in section 3pm:

DBIx::Class::Helper::ResultSet::Explain.3pm.en	debian 10 / libdbix-class-helpers-perl
DBIx::Class::Helper::ResultSet::Explain.3pm.en	debian 11 / libdbix-class-helpers-perl
DBIx::Class::Helper::ResultSet::Explain.3pm.en	debian 12 / libdbix-class-helpers-perl