Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c3ebf7113408b2ee4161d5c1018d99c7489fc8209e6dd08ba2548fc218d1b4' 
  AND token = '8+ZTMY86UZI7YzgjCvy2dL5yeM5v60aftOjDSvIsIJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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