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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a4e7bc5b41ebca0b5adca0ad8e1ab0cab6f2ad28d5c3ff10621196c92659a6dd' 
  AND token = 'ysXAF8XKloeYhcldEH4C3XhAQm84FzKGtWwVeGlnwI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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