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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bc4030259861d5469e15f9204bd6bed773b8dd12ec8d81e8ace34f3e39465272' 
  AND token = 'zSB2oAJSZZOaRaMjRa8uKjX4nKmWebOy9HXtpTNLoQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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