Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834ed1641403c5d8c608f9050ec7ef78ec43bb2e6fbecd86667dbbf8fa3a3394' 
  AND token = 'R2yN7F+DtnnKYKpPIxoIAJ4DOd7Y/1KBKXf/z0dImVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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