Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7db6e6ae9cff8014986cd333b254a837e2975516c8558c3777be46ab003688e' 
  AND token = 'LMOGc242uzz0cHyL9hLs9GSxLvgk2K6RLMbgzDErDQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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