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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e03f42832a76530d7d56b6cddaa0ca6ff6f7152a3d0efc990c08f829e0bd0adb' 
  AND token = 'PFeQyzUK4D1gz9y0qSLr0QJkhKsqwN1A0XOYdwRN4rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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