Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c906149690778158b1e89e8c9ffd15ebab6e39ddc57b67ede756584c5350df37' 
  AND token = 'VxUjFUuP6zJRR7gWGNjv7PW3SIQx2L3l0DONwkLGQA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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