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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '411a57e420a36479fa76466da7efec9d1b85be69ec9291e0b8774b30ef1c16d7' 
  AND token = 'V5v5ukxXssY43nCTmGMKLWURtczG2PE4ywwNyo2sVLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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