Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902338cb29ba887403dd21edbe8f9c49552f17d0a1dbecbd65e0abde3a47a78a' 
  AND token = 'N0ewW95dzs9orFzmdnF2lxAobxL8efl/F/Y+/SxBrUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}