Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c46b5d08963fb4b61a59fe156f63c02a5610a7b3ca80e0296db371b99fe028c' 
  AND token = 'EuWt4DZKXvDAP6d3oMHEUCYd+n4mOFxoO47/rzamgh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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