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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c18e07f11db0407c3eae3f184f6da5bd880130e13329a86c686ab88643487035' 
  AND token = 'UUdCb7c1QFn7GG0o+bODb8mIvdhb6sVdrdgDZN/+TFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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