Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a30fcf54af63b440052f5d5797ed391e53738cb51328ae0ee6f7d87e9cae5b5' 
  AND token = 'SoXrtv6FHf4rXRBlheMu7txb7LE5vRDsZgDSb25UWD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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