Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a9a63de71529621fd31f8a4e60cc482ff415dadd1eea0c6df4e54f25dfa3e9' 
  AND token = 'uB9juPfwTtzQS1LfqaUzBs/VzR7r+Cj+o0bPJlUsC0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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