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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6283dc0bb8c82c0558db4258d9c62383d4f1d423d544fd498eab40a93d0f49bf' 
  AND token = 'IudDzdAop6w5nFEId/ZJiN7VJZp6akmNqLArSFo8BX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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