Hello @giad,
as @elsamuel said first find time difference to previous row. Then I would use Rule Engine node to mark all those rows where difference is lees than 45 seconds. Newly added mark means you have to delete this and previous row judging by your example. To mark above row simulate negative lag (see here). This will give you two columns with marks. To check which rows have mark in either column and filter them I would use Rule-based Row Filter node.
Br,
Ivan