Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be38eefba1262b39bc9140121741fff432b3dc4a82e6215e8bbb7e9f57edeb1f' 
  AND token = 'R17lG4vKVa2ZdAAKHQAHhIW+rQ8v3YZkVuacRurntFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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