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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5867ec9fb01bf42afba714b5c4ea132de00b8590a132b5c1b4263296447b5ab8' 
  AND token = 'NNzK8DQjX2npMhS5bNC3OoFtBWg6ay4ZbG3LxvAIzz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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