Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245ac8908df93dcaf4befc2c3734623e6fc70795f9ae2796b8866ef8bbeb5af7' 
  AND token = 'VgGt7PHQ+0HypPP3VzEJcFQZ7DJSO7E5bBMTHqFNUmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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