Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddfd90b55571d58059592425757d9bf83cb30efcbe8741d40e46e3769cefe66' 
  AND token = 'b/REI0FQ/FmnYPtmsG0Ghv8BU1XFCTbTUIzSUe89T3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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