Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619171fd4669773df8122bc840ce76661df1425c5ddf2cdae6683dda21aa057e' 
  AND token = 'VxVWRC8twgZobYZ46YqHCOx4lde/n2CBl94HgsqfPJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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