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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a2662eb65fd0cb7af21ae3e6cc61eda641f364c63c39b1e7f08f0a6d64c7df15' 
  AND token = '7flg3up2d6cXJSFU1E1xnxVODt3zf9wETQ65Z09ZLVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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