Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b1af8b9954a85fb9e9db719b18dd606d8d8e195d7e247925b0eda0d94fff2d' 
  AND token = 'ZokNtQm4L1E2UUo1Ev8lOJUC/Kz/XtNkWMfw6rV6N5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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