select * from other_table where
mod(
(select count(*) from (
select (_time - 60 * 1000) gate from one_table where event = 123
union all
select (_time + 60 * 1000) gate from one_table where event = 123
)
where _time > gate
), 2) = 1;


select * from other_table
from other_table t1, (select (_time - 60 * 1000) b, (_time + 60 * 1000) e from one_table where event = 123) t2
where t1._time between tt.t1 and tt.t2;