Does Attiny45 could send data through wifi?
by sending it to esp32 first? - yes, it can 
But if you have a ESP, why do you need the tiny?
So only by using esp we could send data through wifi? I made a sensor card using attiny45, and I was thinking to make the sensor card that could send the data through wifi.
There are probably other solutions that involve additional hardware, but the point being made is that by using an ESP32 board you have probably all you need in 1 board.
To do that you need a WiFi module, which in any case will be equipped with its own microcontroller, many times more powerful than the tini45 itself.
So there is no point in attaching wifi to the attiny - if you need wifi, then don't use the tini45- use the ESP and connect the sensor directly to it.
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