Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbf766f69c4459387fcda6b294f66c3f3b3d58f17a4e5284d301cd3213e27f1' 
  AND token = 'bDz3EqdU5f5HwbxOVjrSKH+1vtoCVfLmVlWgN8A1Dn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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