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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '37e7c068a4a45df6e8f666655ad29f933c7e4895b8d50a913520587729a315c1' 
  AND token = '1d01GlQzQq9QGhSF6i3PcO6oI0bKquIQKAntrA8l1wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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