Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e21e5876fd4759654c3be2608162fc6cbadc152610e6a382ee8391b0c3ae5d9' 
  AND token = '/FgNaJ3WIgIAg5osDTk8neLEltBVPjRUw1EuExfqmxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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