SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d967ed6f4e74b012b12062b023fb781a8aa22108ee0e841690f4f518ae9f44d' 
  AND token = 'Evb7qNHWJOKD974mMMhbx6ap5Z5yGnpgWRzKdnZLCoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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