Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c90238642a9adfa6fbb751c30be2535b02d1f5682ae5a3a70e193d016acffc3' 
  AND token = 'lNxPHJ0oR85brihI8OLsGFBHl0FCQ9MBTTQl2s9Geoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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