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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6042cee46670260f9848b06c7b4bbb6357eb52d77dfafc250ce251192ecec8a6' 
  AND token = '7bICC57b2AA+3KH8aVEvkWHYX/kSS/HirhEpsg8pN3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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