Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e479af2694c751cbabee61f4a64b89b8ed254626230551b42ab4a666186eec8' 
  AND token = 'RVLan56MdrsIQ9+nVevIuvMjeNcX5sUrYMi50ZQOY68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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