Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b9f937647131c290bf0e35b2f0ad0704b209cdef8d459dd6484f86e372f87de' 
  AND token = 'N7CmqOeZ+IjcZ0oyzdZwl+FR0GWkKsFXo1Xfbr8mnVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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