Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4ea3ca44397a089e6bc7326530044b58c24e6bc9b71e243d5960a446247d5e' 
  AND token = 'WeVVw+xOR9HW6tjUFNYxjYH2sWVzoqvuvbtrYBHOPW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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