Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ca19561e3864dbd3cbed381a4cb238b9c18251045243265543c0faac91b170' 
  AND token = 'RDH6RS8cXz3C+Lc//G8pgqUzoK2lyOVmsiE4Wqg9brE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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