Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de40e3c7a96e0b9f4b6cf1ddd10ab03fc481ada93d28b0a1545508d8d9b3ca3' 
  AND token = 'oIyqTAB7cQsbYzlHfAdAgHuj8YcETProAvpX6vaEqKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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