Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46dae97de1b64464d021e88f4d85e80d007d0a135629bb986daf07b3330786f' 
  AND token = 'iZc8couBgC9r+60d+lsMgAt9GdDSOOtJMsUfR0bZFlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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