Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe2fd5706868e4b6d036419e6c60b4c0696dbb6176c47cd1d92353bc3f564e1' 
  AND token = 'FWAnVhlvNPXD35CJyMTFlUTPXAPcUrZ7L/rs9/XiQ38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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