Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cff98306fcb10ffd32716bf383bbae32df612043e78f4df7ad42f3daa358fd3' 
  AND token = 'CA9ljPXaOKmuhreyLXIh/AmrdmTb9xoyu5PZTR/ireg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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