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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '33ac5ede76e00dd793d2ca48058225d551a5637c7c7848f1e255b1220e40077d' 
  AND token = '1IL+a+fWrzyLaSR9Hd+Y5LexDkoNE0HsXVu6rVBaEOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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