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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '834a34fdf836995f8850384f41fe2cbfbae04d18ae73ad97924791aaf7cb0a57' 
  AND token = 'tmHomtOOgNNrcK2Op1DXnjB5ULB0cK7TJf4Kmfc4MiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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