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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47bb2872ccd09eda64b5983573c79f59da9b3ccb86f8ac0bfdd62e5a7f0f0bcd' 
  AND token = 'j3CjhurZa204WWEo+XmhuerBbTInQ+/xbkLzMw0NIXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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