Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6eb18b94777a2be54dfa84a6d34e03a8fb0dca0c587613bc8bc0a08e99da12' 
  AND token = '1ZtWe8Vj9hf2eJYlcuQE+5DAnnZpAY8Q3mi3ZGLvPJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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