Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb3bddaf396162f640157a1aea1793e0d3a575785eb1ebe13ec95180b9f4c40c' 
  AND token = 'SsyV8XB7yWDMu3s7b33Y9NkBeKbNTM4gkjnpIUFg2mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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