Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d19c57c53ee79362e103ffaecce3fb7fb9b4b832f243333035c72380c61bd81' 
  AND token = 'dwHTxnKCGsip4LdtXOCRznhDffRvqss+2vlCm45Mis0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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