Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426183979eae5cffd57fcb53ff668cc49ed9da536584f16d2fb813530bbcfda6' 
  AND token = 'WXn7fsUtifRKptRIz6Dk0up4bMtUPOeBntFFnvW3GVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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