SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f65282e2deddca14b6bc4f6264759184801cf0c340471848bcfe855f52f8ed28' 
  AND token = 'BgdV/gLWiLXaWDYtRHxfbw+UyPZhIHMjIEuFeAAIuTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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