SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '075e10afcf971896b55cfe8c150554ad68ed370f027b53a771e94be7e6df04fd' 
  AND token = 'zD0jzKxKLUzSXdIeRLqjuwFa2nxtqJqCSFKb23x3WYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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