Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08b05dd645ae6c332436af8569041dffccc285ad0a6d0de9204a52f9a85f3cb' 
  AND token = 'jObtlC0oGxUQPXQ7QfzLpsY8lE0mw5RaX3AMlGLDnrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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