Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbc5f24b98a25a90951b10d7f807d09a8c71b48197235735c760ac4e84eab15' 
  AND token = 'o/rtzqoS4lKFkut9OcfTRZt0eClzpOf86v1Kdg6kqPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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