Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a816e0530b24ec44b6c389e94bc3f3587f33b8578287684c11a76717a421e345' 
  AND token = 'tPNDz0rUZqO13Di+usJrzjpAIkBu/FrdRZOg9Auj41E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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