Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8ee9556c59ecb4b69bb83c0410c402b3a70e80c05d8a50102a5fc017b1edfb' 
  AND token = 'QRcJ+uvIbfUdwzHqywlTuC2k9QIUoi0nT59xJYjPrak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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