Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42ca6f9396003ac65cd7c66e8d85e90a7e777c985abce9b78fa4e32cde67e42' 
  AND token = 'RiL6wnbSelTXyiFcOhxBa+XfR+13ZpkJ8OmjQzFpuJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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