Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91e84bfdba60bc7b38fa5463e317236c45175711b34b8c566aacaa337a3d2ef' 
  AND token = 'uXOgCAvBW5YdbVuV83a+dUrm72JFUCzzZKFA7VdyIBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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