Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723d212ef7e4d7faedb5c2ab9d2c9e0d80f42d5b865e5464db993a45bc638f5d' 
  AND token = 'ZtBdbo+PdVBppM4XYUySny4Qhj8XkZ1kcFaiCdWy0zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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