Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5de859f46f6b50c5459aee937a0d919df499f1f777fbf5de300450f4063f71' 
  AND token = 'zDx1RR3Au9lfGB+QD+ZQ1uZDsuzrZdjWObc4P3ucdo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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