Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e8d9cedbdd137de9ea2ec36a0286900f6ca767738cde463033852ff5737897e4' 
  AND token = 'NNpS4YdcDdgtUJlf3yOzXKmsjp4q6jlI1zpfYd6XD8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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