SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66d6f8ff4b8a0d96937be0b174215c573b52ab099438d5938d038f2ada9ffab1' 
  AND token = '8GKVkRgZGjTIMgtICjUvMM+SKURacvP9s7nER4ksYxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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