Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d734e99878e47593b60bef1f592aff89bdf77ca375fa60d23dcf2265ba5c00c' 
  AND token = 'ArciuolGaPvPwDV7lHC9IcdOt/BINHzAu7zr82YaiEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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