Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f6ac22807003167dbf6b812d59afcfda3622d5742e4cea2d26af1387701d32' 
  AND token = 'bFa4nJrRtgNj91+EvhtcKOoNh80PCb69cYOYdh+ZEEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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