Simple query runs so long

can you please provide table DDL ?

Even though it simple query it all depends on Query used to create the view ? Athena will run the query behind the view and finally min(dt) on that. What kind of Athena data source here ? backed by glue catalog ? if partitioned column like date try to use partition index in glue https://docs.aws.amazon.com/glue/latest/dg/partition-indexes.html