Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '657475374d22bb751777f644894da53a667cd07fd13bfb18c6c8ba2fbe75b06b' 
  AND token = '0v/pzV9v+95rFN1/1bLOgq7SmsOrFrwC3UTr4qNN9PI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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