SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '57493972752613573728162fcde3f3cb6357f749b68951b23efc3d14ef9a9a9b' 
  AND token = 'xCs/hyImpmpByPpU4HI7AXlfwX+BZYqO+fkT8Huyxi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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