SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c0a3e94a86b8f325bf9aaf2b897cc87020d1fcf3e05b6f65cfd49a834b81e48e' 
  AND token = 'u7Wagf1NfHzq4qOWZqCoqFvq5guZW+4YULjUUzIM+pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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