Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75549289d4a975ec406cd6c156a60d92062788137871e2ea518958d49520754' 
  AND token = '1Xq7b8gGxlxvB5Alk05ogZwsIDMVtC1xjPYT8HD9s5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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