Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5c01c57dbcbb8b19036e9e39aa2cca04c3eac9c9ee995082449003a2b25a48' 
  AND token = 'XgzUj5D1DWxE9KSSXQLsMw6ItBX5iZQG3jtYhMu0cg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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