Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21f835f385b279bb5a591b8384fc483e86c97adf84c0bacfdc02b4b47e5c016d' 
  AND token = '4BY4MM3WBzmXhA56lONoJrtBdDysUUTXcALqj/u0Tb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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