Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d687634c14e660165ecaa0354683f158fd66278bc18b9e349de62fcbf82d811' 
  AND token = 'XmG8V02lleUVpykTIILy2H1IgZJSHjeBdyDgDqMnTVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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