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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e141da02d5e931b3c32306130e5ed8c6b0f28cf8bdce2db45b7648fb4294102d' 
  AND token = 'HOIlHfRgIUvWhZ7FX37SpF+R7ZoQUowvymuaRL/1dyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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