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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4e3d5b66eb46d5ad9ee2d786ee9c92de712d4954e3c2b7be2f84f803219deaeb' 
  AND token = 'jBtBEaX8JnRN7WRhuot/IaU0eymG5A0I3iM3WB2MrRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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