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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7341561d5c435948b7212ea7e479de04faf3b1acef5987261af82d15d549b548' 
  AND token = 'KtW3+llhCciruN1tvuOz2yfXeOa6qNdaqfo8IGKim+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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