Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ac213bb358d2a4c617203ec67b0860f172316a8de2900c37a098c296b7454f' 
  AND token = '8aBjr/oiHVv472xmfj5tb5eij7FmmnlvytrPoN+2LuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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